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Paper   IPM / Physic / 9596
School of Physics
  Title:   Dynamical Response Functions and Collective Modes of Bilayer Graphene
  Author(s): 
1.  G. Borghi
2.  M. Polini
3.  R. Asgari
4.  A.H. MacDonald
  Status:   Published
  Journal: Phys. Rev. B (R)
  Vol.:  80
  Year:  2009
  Pages:   241402
  Supported by:  IPM
  Abstract:
Bilayer graphene (BLG) has recently attracted a great deal of attention because of its electrically tunable energy gaps and its unusual electronic structure. In this Letter we present analytical and semi-analytical expressions, based on the four-band continuum model, for the layer-sum and layer-diference density response functions of neutral and doped BLG. These results demonstrate that BLG density-functions exhibit either single-component massive-chiral character or standard two-layer character, depending on energy and doping.

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